build: use Debian-based Node image to avoid musl native dependency issues

Dockerfile

@@ -1,5 +1,7 @@
 # ---- Build stage ----
-FROM node:22-alpine AS build
+# Use Debian-based Node to avoid musl/native optional dependency issues
+# (rollup optional native binaries may be missing for musl/alpine)
+FROM node:22-bullseye-slim AS build
 WORKDIR /app
 
 # Install dependencies first so Docker can cache this layer